data = map(float, raw_input().split())
x1 = data[0]
y1 = data[1]
x2 = data[2]
y2 = data[3]

distance = ((x1 - x2)**2 + (y1 - y2)**2)**0.5
print("{:.8f}".format(distance)) data = map(float, raw_input().split()) data map(float, raw_input().split()) map float raw_input().split() ().split () raw_input split x1 = data[0] x1 data[0] data 0 y1 = data[1] y1 data[1] data 1 x2 = data[2] x2 data[2] data 2 y2 = data[3] y2 data[3] data 3 distance = ((x1 - x2)**2 + (y1 - y2)**2)**0.5 distance ((x1 - x2)**2 + (y1 - y2)**2)**0.5 (x1 - x2)**2 + (y1 - y2)**2 (x1 - x2)**2 x1 - x2 x1 x2 2 (y1 - y2)**2 y1 - y2 y1 y2 2 0.5 print("{:.8f}".format(distance)) print "{:.8f}".format(distance) "{:.8f}".format "{:.8f}" format distance distance = ((x1 - x2)**2 + (y1 - y2)**2)**0.5 ((x1 - x2)**2 + (y1 - y2)**2)**0.5 distance x2 = data[2] data[2] x2 y2 = data[3] data[3] y2 x1 = data[0] data[0] x1 data = map(float, raw_input().split()) map(float, raw_input().split()) data y1 = data[1] data[1] y1
data = map(float, raw_input().split())
x1 = data[0]
y1 = data[1]
x2 = data[2]
y2 = data[3]

distance = ((x1 - x2)**2 + (y1 - y2)**2)**0.5
print("{:.8f}".format(distance))